RE: [R] missing values imputation

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From: Liaw, Andy (andy_liaw@merck.com)
Date: Thu 13 May 2004 - 02:55:46 EST


Message-id: <3A822319EB35174CA3714066D590DCD504AF7D82@usrymx25.merck.com>


> From: Rolf Turner
>
> Anne Piotet wrote:
>
> > What R functionnalities are there to do missing values imputation
> > (substantial proportion of missing data)? I would prefer to use
> > maximum likelihood methods ; is the EM algorithm implemented? in
> > which package?
>
> The so-called ``EM algorithm'' is ***NOT*** an
> algorithm. It is a methodology or a unifying concept.
> It would be impossible to ``implement'' it. (Except
> possibly by means of some extremely advanced and
> sophisticated Artificial Intelligence software.)

Yes, but EM for missing value imputation is a bit narrower, I guess. At
least the `norm' package on CRAN has em.norm() for multivariate gaussian...

Andy

 
> cheers,
>
> Rolf Turner
> rolf@math.unb.ca
>
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